81406286 has 24 divisors (see below), whose sum is σ = 132932664. Its totient is φ = 37371360.

The previous prime is 81406249. The next prime is 81406291. The reversal of 81406286 is 68260418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76196 + ... + 77256.

It is an arithmetic number, because the mean of its divisors is an integer number (5538861).

Almost surely, 2^81406286 is an apocalyptic number.

81406286 is a deficient number, since it is larger than the sum of its proper divisors (51526378).

81406286 is a wasteful number, since it uses less digits than its factorization.

81406286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 81406286 is about 9022.5432113124. The cubic root of 81406286 is about 433.3970795109.

The spelling of 81406286 in words is "eighty-one million, four hundred six thousand, two hundred eighty-six".